e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
Tetrahedron
Etude des petits cycles—XXXVII: syntheses et proprietes spectrales du tetracyclopropylidene ([4] rotane) et des composes polycyclopropylspiraniques de la serie
JM Denis, P Le Perchec, JM Conia
Index: Denis,J.M. et al. Tetrahedron, 1977 , vol. 33, p. 399 - 408
The syntheses of [4] rotane and polycyclopropylspiranic derivatives are reported. One route involves the formation of cyclopropane rings from C4-acyloins; a second route uses the dimerisation of bicyclopropylidene. Spectroscopic data do not point to any particular electronic interactions between cyclopropane rings in these compounds.